I have a problem with the SPI communication on AD7176-2.
I'm able to write in the registers respecting the clock format given by the datasheet, however I can't read any data from it.
The SPI communication works with a quadrature counter on the same board so I think it's a problem with the protocole of communication with the ADC.
I added pull up resistors without any effect.
Changing frequency didn't give a better result.
I've tried to read and/or write in the different ADC mode, setup all the configuration for one channel, add delay between the write command and the answer, more delay for the chip select.
If you could please help with this problem.
The following clock format show a try of reading the ID of ADC.
CS : Blue
Clock : Yellow
DIN/MOSI : Pink
DOUT/MISO : Green
The ADC seems to answer to right only the first bit of the ID, 0x0C9X
You can observe some glitches which appear only during the reading